Docker on Ubuntu 22 cannot connect to any external internet address

Hey! I'm facing a weird problem using Docker on a fresh new installation of Ubuntu 22 Desktop. Everytime that I ran the command docker compose up, it tries to get packages from apk repository (Im using an Alpine based image).

The problem is that the repository is not accessible inside my Docker container. It cannot reach any internet address.

Here is my Dockerfile example

FROM php:8.3.13-fpm-alpine3.20

# The error occurs here
RUN apk add --update --upgrade --no-cache \
    nginx \
    supervisor \
    linux-headers \
    ghostscript \
    imagemagick-dev \
    imagemagick \
    imagemagick-libs \
    gnupg \
    vim \
    git \
    bash \
    autoconf \
    g++ \
    make \
    libzip-dev \
    libedit-dev \
    icu-dev \
    libxml2-dev \
    freetds \
    php-common \
    php-odbc \
    php-pdo \
    freetds \
    unixodbc \
    freetype \
    libpng \
    libjpeg-turbo \
    freetype-dev \
    libpng-dev \
    libjpeg-turbo-dev \
    postgresql-dev \
  &&  printf "no\n" \
   | pecl install redis-5.3.7 \
  && printf "yes\n" \
  && pecl install zip-1.22.4 \
  && pecl install xdebug-3.3.0 \
#  && pecl install imagick \
  && docker-php-ext-configure gd  \
  && docker-php-ext-install gd \
  && docker-php-ext-enable  \
    gd \
#    php8-pecl-imagick \
    redis \
    zip

Wen I run docker compose up, it throws me the following error

=> ERROR [app83 2/28] RUN apk add --update --upgrade --no-cache     nginx     supervisor     linux-headers     ghostscript      10.4s
------                                                                                                                                        
 > [app83  2/28] RUN apk add --update --upgrade --no-cache     nginx     supervisor     linux-headers     ghostscript     imagemagick-dev     imagemagick     imagemagick-libs     gnupg     vim     git     bash     autoconf     g++     make     libzip-dev     libedit-dev     icu-dev     libxml2-dev     freetds     php-common     php-odbc     php-pdo     freetds     unixodbc     freetype     libpng     libjpeg-turbo     freetype-dev     libpng-dev     libjpeg-turbo-dev     postgresql-dev   &&  printf "no\n"    | pecl install redis-5.3.7   && printf "yes\n"   && pecl install zip-1.22.4   && pecl install xdebug-3.3.0   && docker-php-ext-configure gd    && docker-php-ext-install gd   && docker-php-ext-enable      gd     redis     zip:
0.131 fetch https://dl-cdn.alpinelinux.org/alpine/v3.20/main/x86_64/APKINDEX.tar.gz
5.137 WARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.20/main: temporary error (try again later)
5.137 fetch https://dl-cdn.alpinelinux.org/alpine/v3.20/community/x86_64/APKINDEX.tar.gz
10.14 WARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.20/community: temporary error (try again later)
10.14 ERROR: unable to select packages:
10.14   autoconf (no such package):
10.14     required by: world[autoconf]
10.14   bash (no such package):
10.14     required by: world[bash]
10.14   freetds (no such package):
10.14     required by: world[freetds]
10.14   freetype (no such package):
10.14     required by: world[freetype]
10.14   freetype-dev (no such package):
10.14     required by: world[freetype-dev]
10.14   g++ (no such package):
10.14     required by: world[g++]
10.14   ghostscript (no such package):
10.14     required by: world[ghostscript]
10.14   git (no such package):
10.14     required by: world[git]
10.14   gnupg (no such package):
10.14     required by: world[gnupg]
10.14   icu-dev (no such package):
10.14     required by: world[icu-dev]
10.14   imagemagick (no such package):
10.14     required by: world[imagemagick]
10.14   imagemagick-dev (no such package):
10.14     required by: world[imagemagick-dev]
10.14   imagemagick-libs (no such package):
10.14     required by: world[imagemagick-libs]
10.14   libedit-dev (no such package):
10.14     required by: world[libedit-dev]
10.14   libjpeg-turbo (no such package):
10.14     required by: world[libjpeg-turbo]
10.14   libjpeg-turbo-dev (no such package):
10.14     required by: world[libjpeg-turbo-dev]
10.14   libpng (no such package):
10.14     required by: world[libpng]
10.14   libpng-dev (no such package):
10.14     required by: world[libpng-dev]
10.14   libxml2-dev (no such package):
10.14     required by: world[libxml2-dev]
10.14   libzip-dev (no such package):
10.14     required by: world[libzip-dev]
10.14   linux-headers (no such package):
10.14     required by: world[linux-headers]
10.14   make (no such package):
10.14     required by: world[make]
10.14   nginx (no such package):
10.14     required by: world[nginx]
10.14   php-common (no such package):
10.14     required by: world[php-common]
10.14   php-odbc (no such package):
10.14     required by: world[php-odbc]
10.14   php-pdo (no such package):
10.14     required by: world[php-pdo]
10.14   postgresql-dev (no such package):
10.14     required by: world[postgresql-dev]
10.14   supervisor (no such package):
10.14     required by: world[supervisor]
10.14   unixodbc (no such package):
10.14     required by: world[unixodbc]
10.14   vim (no such package):
10.14     required by: world[vim]
------
failed to solve: process "/bin/sh -c apk add --update --upgrade --no-cache     nginx     supervisor     linux-headers     ghostscript     imagemagick-dev     imagemagick     imagemagick-libs     gnupg     vim     git     bash     autoconf     g++     make     libzip-dev     libedit-dev     icu-dev     libxml2-dev     freetds     php-common     php-odbc     php-pdo     freetds     unixodbc     freetype     libpng     libjpeg-turbo     freetype-dev     libpng-dev     libjpeg-turbo-dev     postgresql-dev   &&  printf \"no\\n\"    | pecl install redis-5.3.7   && printf \"yes\\n\"   && pecl install zip-1.22.4   && pecl install xdebug-3.3.0   && docker-php-ext-configure gd    && docker-php-ext-install gd   && docker-php-ext-enable      gd     redis     zip" did not complete successfully: exit code: 30

It cannot reach the https://dl-cdn.alpinelinux.org, but If I try with another external URL, it cannot reach too (I've tried to add a RUN ping google.com).

Anyone knows how do solve this problem?

LaryAI

1 year ago

Level 58

The issue you're experiencing is likely related to Docker's network configuration on your Ubuntu 22 system. Here are a few steps you can take to troubleshoot and resolve the problem:

Check Docker Network Configuration: Ensure that Docker's network is set up correctly. You can inspect the Docker network settings using the following command:
```
docker network inspect bridge
```
Look for any anomalies in the configuration, such as incorrect IP ranges or missing DNS settings.
Restart Docker Service: Sometimes, simply restarting the Docker service can resolve network issues:
```
sudo systemctl restart docker
```
Check DNS Settings: Docker containers use the host's DNS settings by default. Ensure that your host machine's DNS is configured correctly. You can check your DNS settings in /etc/resolv.conf. If necessary, you can specify a custom DNS server for Docker by editing or creating the /etc/docker/daemon.json file:
```
{
  "dns": ["8.8.8.8", "8.8.4.4"]
}
```
After making changes, restart the Docker service:
```
sudo systemctl restart docker
```
Test Network Connectivity: Run a simple Alpine container to test network connectivity:
```
docker run --rm alpine ping -c 4 google.com
```
If this fails, it indicates a broader network issue with Docker.
Check Firewall Settings: Ensure that your firewall settings are not blocking Docker's network traffic. You can temporarily disable the firewall to test:
```
sudo ufw disable
```
If this resolves the issue, you'll need to adjust your firewall rules to allow Docker traffic.
Update Docker: Ensure that you are using the latest version of Docker. Sometimes, network issues are resolved in newer releases.
Check for Conflicting Software: Ensure that no other software is interfering with Docker's network. VPNs, for example, can sometimes cause issues.

By following these steps, you should be able to diagnose and resolve the network connectivity issue within your Docker containers on Ubuntu 22. If the problem persists, consider checking Docker's GitHub issues page or forums for any known issues specific to your version.

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